Door-latch attachment.



PATENTED DEC. '26, 1905.

J. S. JOHNSON. DOOR LATCH ATTACHMENT.

APPLICATION FILED JAN. 3L 1905. FIG.

K/INVEN via/:7? 4% v WITNESSES,

UNITED STATES PATENT FFICE.

JOSEPH S. JOHNSON, OF SAN FRANCISCO, CALIFORNIA, ASSIGNOR OF ONE- HALF TO FRANCIS CUTTING, OF SAN FRANCISCO, CALIFORNIA.

DOOR-LATCH ATTACHMENT.

Specification of Letters Patent.

Patented Dec. 26, 1905.

Application filed January 3, 1905. Serial No. 239,337.

To aZZ whom it may concern.-

Be it known that I, J OSEPH S. J OHNSON, a citizen of the United States, residing in the city and in the county of San Francisco, State of California, have invented new and useful Improvements in Door-Latch Attachments, of which the following is a specification.

My invention relates to an announcing attachment for the latches of doors.

It consists of a suitable sounder and means whereby the attention of the inmates of a room will be attracted by the turning of a knob to open the door.

It comprises a combination of parts and details of construction, which will be more fully explained by reference to the accompanying drawings, in which Figure 1 illustrates one form of my invention. Fig. 2 is a section on line as w of same. Fig. 3 is a modification thereof.

As shown in the drawings, A is the casing, which may be of any suitable form and size for an Outside or amortise lock. Such locks usually have in the same case the locking-bolt 2 and' the spring-actuated latch-bolt 3. This bolt is withdrawn to allow the door to be opened by means of a knob the shank of which passes through an opening 4. in a turnable part, which acts to retract the bolt 3 against the closing tension of a spring 5. These parts being of any usual or well-known construction are only named as the foundation for my invention.

As shown in Fig. 1, 7 is a bell or sounder of any desired description, which may be inclosed within the lock-case or contiguous thereto, and 8 is a hammer, the arm 9 of which is pivoted, as shown at 10. This arm is acted upon by a spring, as at 11, which normally holds the hammer out of contact with the bell and also holds the hammer-handle or extension thereof in engagement with a part which is actuated by the turning of the knob and the movement of the part within which the socket a is formed.

As shown in Fig. 1, the socket 4 is formed in a turnable socket-piece 12, the lower end of which has formed upon it teeth or projec tions, as at 13.

The arm 14, which is pivoted at 10 and which carries the hammer-handle 9, has a point or tooth, as at 15, projecting in such a manner that it is normally held in the path of travel of the teeth 13 by the action ofthe spring 11. Thus when the part 12 is turned by the turning of the knob to withdraw the bolt 3 the teeth 13 and 15 will engage and tilt the arm 14 against the tension of the spring 11, and when released the arm will return to its normal position, causing the hammer 8 to strike the bell or sounder 7.

The device may be so constructed as to make one or a plurality of strokes during the turning of the knob in each direction.

If it is desired to disengage the sounding mechanism, it is effected by means of a pivoted arm 16, which is turnable, so that it will press the end of the arm 14 downward sufficiently to carry the point 15 out of the line of movement of the points 13. The knob can then be turned and the door opened without any alarm.

In Fig. 3 the extension of the hammer-handle forming the arm 14 has its point 15 engaging with the corresponding teeth or points formed in the part 13, and in this case instead of this part being directly connected with the part 12, which is turned by the knob, it is pivoted, as shown at 17, and has its lower end also toothed, so as to engage with teeth 18, formed upon the bolt 3. The bolt in this case is connected by a pin, as at 19, so as to be operated by the turning of the knob, as previously described, this arrangement being adapted to another form of look from that shown in Fig. 1, but having the same efiect and being substantially an equivalent construction.

Having thus described my invention, What I claim, and desire to secure by Letters Patent, is-

The combination with a latch-bolt provided with teeth, a hell or sounder, and a pivoted hammer-operator, of a rocking arm having one portion provided with a line of teeth to engage the hammer-operator and having a hub portion provided with teeth to engage those on the bolt whereby the hammer-operator is positively moved by both the forward and rearward movement of the bolt.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

JOSEPH S. JOHNSON.

Witnesses:

S. H. NOURSE, J nssrn C. BRODIE. 

